Restructural confirmation and photocatalytic applications of graphene oxide–gold composites synthesized by Langmuir–Blodgett method

Kuḿar, V.; Bahadur, Nupur; Sachdev, Divya; Gupta, Shweta; Reddy, G. B.; Pasricha, Renu

doi:10.1016/j.carbon.2014.08.067

Cited by 21 publications

(21 citation statements)

References 64 publications

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“…21,22 To improve its photocatalytic performance, it is highly desirable to combine carbonaceous materials with SiO2, as various studies indeed describe their efficacy for remediation of contaminated water. [23][24][25][26] The latest addition to carbonaceous materials is graphene which is a perfectly two dimensional, sp 2 hybridized carbon. The ultrafast Dirac Fermions (near the k and k' points) render exceptional transport properties in graphene.…”

Section: Introductionmentioning

confidence: 99%

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Arshad

Iqbal

Mansoor

et al. 2017

Journal of Applied Physics

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ABSTRACT:The exceptional conducting nature of graphene makes it a viable candidate for enhancing the effectiveness of photocatalytic and biomedical nanomaterials. Herein, the immobilization of monodispersed silicon dioxide (SiO2) nanoparticles on multiple graphene layers is demonstrated for intercalation of graphene nanoplatelets (GNPs). Interestingly, the loading of graphene nanoplatelets with SiO2 nanoparticles enhances the photocatalytic efficiency from 46% to 99%. For biomedical applications, it is found that 75% of Gram positive and 50% of Gram negative bacteria have been killed, hence bacterial proliferation is significantly restricted. Further, the cytotoxicity study reveals that the synthesised nanocomposites are non-toxic for both normal (HCEC) and cancerous (MCF-7, HEp-2) cell lines which signifies their potential as carriers for drug delivery. The prepared nanocomposites with controlled amount of carbon in the form of graphene can be employed for photocatalysis based waste water remediation, biomedicine and nano drug delivery.

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Section: Introductionmentioning

confidence: 99%

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Arshad

Iqbal

Mansoor

et al. 2017

Journal of Applied Physics

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“…Attapulgite contains Mg 2+ and Ca 2+ , and the presence of these metal ions also plays a role in the coagulation of GO [ 61 ]. Meanwhile, in the coexistence environment of attapulgite and GO, the -OH on the surface of ATP can be complexed with -COOH on the surface of GO [ 62 ].…”

Section: Resultsmentioning

confidence: 99%

Adsorption Properties and Mechanism of Attapulgite to Graphene Oxide in Aqueous Solution

Fang

Jiang

et al. 2022

IJERPH

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In order to remove toxic graphene oxide (GO) from aqueous solution, attapulgite (ATP) was used as adsorbent to recycle it by adsorption. In this paper, the effects of different pH, adsorbent mass, GO concentration, time and temperature on the adsorption of GO by attapulgite were studied, and the adsorption performance and mechanism were further explored by XRD, AFM, XPS, FTIR, TEM and SEM tests. The results show that when T = 303 K, pH = 3, and the GO concentration is 100 mg/L in 50 mL of aqueous solution, the removal rate of GO by 40 mg of attapulgite reaches 92.83%, and the partition coefficient Kd reaches 16.31. The adsorption kinetics results showed that the adsorption equilibrium was reached at 2160 min, and the adsorption process could be described by the pseudo-second-order adsorption equation, indicating that the adsorption process was accompanied by chemical adsorption and physical adsorption. The isotherm and thermodynamic parameters show that the adsorption of GO by attapulgite is more consistent with the Langmuir isotherm model, and the reaction is a spontaneous endothermic process. The analysis shows that attapulgite is a good material for removing GO, which can provide a reference for the removal of GO in an aqueous environment.

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“…15 At the same time, agglomeration of the graphene hinders the formation of a good contact interface between the graphene and the ceramic matrix and damages its microstructure, thus affecting the improvement of the mechanical properties of the composite material. [19][20][21] A large number of oxygen-containing groups on the GO surface have the ability to react with organic and inorganic components to participate in novel surface/interface chemical reactions. 17 Graphene oxide (GO), a layered material consisting of oxygen-containing functional groups on its basal planes and edges, 18 such as hydroxyl groups, carboxylic groups, and epoxy groups, has attracted wide attention due to its unique two-dimensional structure, extraordinary mechanical properties, and rich chemical properties.…”

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confidence: 99%

“…17 Graphene oxide (GO), a layered material consisting of oxygen-containing functional groups on its basal planes and edges, 18 such as hydroxyl groups, carboxylic groups, and epoxy groups, has attracted wide attention due to its unique two-dimensional structure, extraordinary mechanical properties, and rich chemical properties. [19][20][21] A large number of oxygen-containing groups on the GO surface have the ability to react with organic and inorganic components to participate in novel surface/interface chemical reactions. 22 Moreover, the oxygen-containing functional groups not only enable GO to be easily dispersed in aqueous media and solvents but also allow GO to be used to construct various graphene-based composite materials.…”

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confidence: 99%

Preparation and mechanical properties of Si₃N₄ nanocomposites reinforced by Si₃N₄@rGO particles

Chen

Zhang

et al. 2019

J Am Ceram Soc

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A new type of reduced graphene oxide‐encapsulated silicon nitride (Si3N4@rGO) particle was synthesized via an electrostatic interaction between amino‐functionalized Si3N4 particles and graphene oxide (GO). Subsequently, the Si3N4@rGO particles were incorporated into a Si3N4 matrix as a reinforcing phase to prepare nanocomposites, and their influence on the microstructure and mechanical properties of the Si3N4 ceramics was investigated in detail. The microstructure analysis showed that the rGO sheets were uniformly distributed throughout the matrix and firmly bonded to the Si3N4 grains to form a three‐dimensional carbon network structure. This unique structure effectively increased the contact area and load transfer efficiency between the rGO sheets and the matrix, which in turn had a significant impact on the mechanical properties of the nanocomposites. The results showed that the nanocomposites with 2.25 wt.% rGO sheets exhibited mechanical properties that were superior to monolithic Si3N4; the flexural strength increased by 83.5% and reached a maximum value of 1116.4 MPa, and the fracture toughness increased by 67.7% to 10.35 MPa·m1/2.

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Restructural confirmation and photocatalytic applications of graphene oxide–gold composites synthesized by Langmuir–Blodgett method

Cited by 21 publications

References 64 publications

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Adsorption Properties and Mechanism of Attapulgite to Graphene Oxide in Aqueous Solution

Preparation and mechanical properties of Si₃N₄ nanocomposites reinforced by Si₃N₄@rGO particles

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Restructural confirmation and photocatalytic applications of graphene oxide–gold composites synthesized by Langmuir–Blodgett method

Cited by 21 publications

References 64 publications

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

Adsorption Properties and Mechanism of Attapulgite to Graphene Oxide in Aqueous Solution

Preparation and mechanical properties of Si3N4 nanocomposites reinforced by Si3N4@rGO particles

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Preparation and mechanical properties of Si₃N₄ nanocomposites reinforced by Si₃N₄@rGO particles